Cryogenic Storage & LNG Equipment worked example

Cryogenic Maintenance Interval Workload at 7.2% isolation, purge, and restart allowance: a worked example

Suppose isolation, purge, and restart allowance falls to 7.2%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate maintenance hours for cryogenic storage equipment based on service tasks, crew completion rate, and outage allowance.

The inputs for this scenario

  • Cryogenic maintenance tasks due this interval: 120 tasks (held at the documented default)
  • Technician task completion rate: 12 tasks / hr (held at the documented default)
  • Isolation, purge, and restart allowance: 7.2 % (the input this scenario stresses; the baseline uses 10)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base maintenance labor = cryogenic maintenance tasks due รท maintenance task completion rate.
  • Required maintenance interval labor works out to 10.72 hr at these inputs, and this is the headline figure for the scenario.
  • Base maintenance labor works out to 10 hr at these inputs.
  • Cryogenic service allowance works out to 7.2 % at these inputs.
  • Maintenance task completion rate works out to 12 pieces / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where isolation, purge, and restart allowance sits at 10% and the headline result is 11 hr, this scenario comes in 2.55% below the baseline at 10.72 hr.
  • It estimates the labor hours an interval needs by dividing tasks due by completion rate, then adding an allowance for isolation, purge, and restart. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Required maintenance interval labor: 10.72 hr (headline result)
  • Base maintenance labor: 10 hr
  • Cryogenic service allowance: 7.2 %
  • Maintenance task completion rate: 12 pieces / min

Run it with your numbers

  • To rerun this with your own numbers, open the live Cryogenic Maintenance Interval Workload calculator, set isolation, purge, and restart allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.